Fig. 6

An overview of the tools used. The yellow bar is the number of unique and non-custom made tools (e.g., NiFi, Kafka). The green bar is the number of custom tools (e.g., ad hoc scripts/applications). The red bar shows the number of pipelines that did not use any tool for that specific stage. The blue bar counts the number of cases of uncertainty in the results (e.g., a paper includes a tool in its figure of the data analysis pipeline but then does not mention it in-text)